Blade assembly for papermaking machines

ABSTRACT

An assembly to be used for foil blades, flat top deflector blades, forming board blades and other replacable wear strips which span a papermaking machine providing quick blade removal while the machine is in the operating as well as nonoperating condition and wherein accurate seating and firm gripping of the blade is accomplished during normal operation. The base of the blade is positioned within a channel in a support member and held in place by a bar provided with a series of inclined wedge surfaces. Each wedge surface engages a pin on the support member such that longitudinal motion of the bar creates a transverse, horizontal force which effects fixed engagement of the blade base with the channel wall of the support member.

United States Patent 72] Inventor Perry 0. Pherson West Suffield, Conn. [21] Appl. No. 862,348 [22] Filed Sept. 30, 1969 [45] Patented Nov. 9, 1971 [73] Assignee A. P. Wagenknecht Co., Inc.

Thompsonville, Conn.

[ BLADE ASSEMBLY ,EOB HEB-MAKIN MACHINES 2 Claims, 5 Drawing Figs.

[52] US. Cl 162/352, 162/374 [51] lnt.Cl D21g9/00 [50] Field of Search 162/352, 374

[56] References Cited UNITED STATES PATENTS 3,201,308 8/1965 Goddard et al. 162/374 X Fife l62/374X 162/374 X 3,393,124 7/l968 Klingleretal... 3,535,204 l0/l970 Truxa Primary Examiner-S. Leon Bashore Assistant ExaminerThomas G. Scavone Attorney-Kane, Dalsimer, Kane, Sullivan and Kurucz ABSTRACT: An assembly to be used for foil blades, flat top deflector blades, forming board blades and other replacable wear strips which span a papermaking machine providing quick blade removal while the machine is in the operating as well as nonoperating condition and wherein accurate seating and firm gripping of the blade is accomplished during normal operation. The base of the blade is positioned within a channel in asupport member and held in place by a bar provided with a series of inclined wedge surfaces. Each wedge surface engages a pin on the support member such that longitudinal motion of the bar creates a transverse, horizontal force which effects fixed engagement of the blade base with the channel wall ofthe support member.

Water removal can be accomplished in a paper-making machine by passing the wire or web over a blade whose configuration and position on the machine is important. The angle of blade slope and geometrical shape of the blade are important considerations since they dictate to a large extent the efficiency of water removal. Consequently, it is necessary to accurately machine the blade so that it is secured in the position in the blade holder and will remain so for extended periods while in use. 7

In order to provide for firm gripping of the blade in position and to provide for ease of removal of blade, support devices have been developed which are used to hold the blade in position in the blade holder itself. Blade support and holder assemblies presently available do not provide ample clearance for ease in removing or replacing a blade nor do they provide solid clamping of the blade for operating conditions. The former is necessary for quick and easy blade change during operation. The latter is necessary for vibration free operation ofwater doctors, foils and other blades.

SUMMARY OF THE INVENTION An assembly for removing water from a moving wire or web of a papermaking machine including a drainage blade, an upper surface of the blade adapted to support a wire or web moving thereover, a blade support, an upwardly directed support surface of the blade support, downwardly directed first and second blade surfaces of the blade, the first blade surface being adjacent the support surface, a wedge bar, a wedge surface of the wedge bar adjacent the second blade surface, first wedge means supported by the blade support, second wedge means supported by the wedge bar and in operative relation with the first wedge means and urging the wedge bar and the wedge surface in contact with the second blade surface, the first and second wedge means being constructed and arranged so that the position of one with respect to the other determines the force with which the wedge bar is urged toward the second blade surface and means for varying the positions of the first and second wedge means with respect to one another.

DESCRIPTION OF THE DRAWINGS FIG. I is a plan view of an improved drainage assembly with portions broken away and in section to disclose certain of the details of the configuration and with the blade removed.

FIG. 2 is a side elevation ofthe assembly shown in FIG. 1.

FIG. 3 is an end elevation of the assembly shown in FIG. 1.

FIG. 4 is an enlarged fragmentary plan view of the portion of the assembly wherein the wedge means is located with the blade removed; and

HO. 5 is a sectional view taken along the line 55 in the direction of the arrows in FIG. 4.

PREFERRED EMBODIMENT In the figures the number is used to designate a drainage blade. The upper surface of the drainage blade is indicted by the number 12 and a felt or wire 14 is shown traveling across and supported by the upper blade surface 12. The blade is supported by blade support 16 which is provided with a channel 18 in which projecting portion 20 of blade 10 is disposed. Channel 18 extends the length of blade support 16 and as shown in the figures this channel is transverse of a papermaking machine and substantially perpendicular of direction of travel ofthe felt or wire 14. Projection 20 of the blade, seen in the FIGS. 3 and 5, provides downwardly directed first and second blade surfaces 22 and 24 respectively with blade surface 22 adjacent support surface 26 of the blade support 16.

Blade support 16 is provided with a plurality of cylindrical pins 28 within pin receiving slots 30 which are disposed on the same centerline with each partially within wall 32 and base 34 of the channel 18. The pins are maintained in position by suitable fastening meanssuch as by welding at 36.

he wedge bar is designated in the figures by the numeral 38. It is rectangular in cross section at its main body portion 40 and with cylindrical end, provided with slot 42 at one end. A pin 44 is supported by the blade support 16 and the pin 44 projects within channel 18. Pin 44 is within slot 42 in the assembled condition of the blade support and wedge bar and the wedge bar is movable with respect to the blade support within channel 18 with the pin 44 within slot 42.

The remaining end of the wedge bar is designated by the numeral 46 and is rounded and threaded.

Grooves 48 are provided in the wedge bar in which small wedges 50 are inserted and welded. These wedges 50 are complimentary to pins 28 and have inclined surfaces in operative engagement therewith. Hence surface 38 of the wedge bar provides a wedge surface adjacent the second blade surface 24. The cylindrical pins 28 provide a first wedge means supported by the blade support and the wedges 50 provide a second wedge means supported by the wedge bar. First and second wedge means are in operative relation and urge the wedge bar and the wedge surface in contact with the second blade surface. The inclined surface of the wedge 50 in contact with the associated pin 28 determines the force with which the wedge bar is urged toward the second blade surface and the position of the wedge bar within the channel determines the portion of the inclined plane in contact with the respective pin so that the force with which the wedge bar is urged toward the second blade surface can be varied by varying the position of the wedge bar within the channel and hence the relative positions of the first and second wedge means.

The threaded cylindrical end 46 of the wedge bar is received within threaded insert 52 of holder 54. The holder 54 has a square projecting portion 56, a body portion 58 and a cylindrical flange 60 spaced from body portion 58 providing a channel 62 within which plate 64 resides. The plate 64 is attached to the blade support so that rotation of member 54 results in transverse movement of the wedge bar relative to the direction of movement of the felt or wire. In other words, the wedge bar can be disposed transversely within channel 18 by rotation of member 54. It is for this purpose that end 56 is in the form of a square cross section to allow grasping with a wrench. The relative position transversely of the wedge bar within the channel determines the relative position of each of the wedges 50 with respect to its associated pin 28 and hence determines the force with which the wedge bar is urged toward the blade surface 24 and hence the force with which the projection 20 is maintained within the channel 18.

What is claimed is:

1. A blade assembly for use in a papermaking machine including in combination a blade, an upper surface ofsaid blade, a blade support, an upwardly directed support surface of said blade support, downwardly directed first and second blade surfaces of said blade, said first blade surface adjacent said support surface, a wedge bar, a wedge surface of said wedge bar adjacent said second blade surface, first wedge means supported by said blade support, second wedge means supported by said wedge bar and positioned to urge said wedge bar and said wedge surface in contact with said second blade surface, one of said wedge means having an inclined surface and means for varying the positions of said first and second wedge means with respect to one another.

2. An assembly in accordance with claim 1 in which a channel is formed in said blade support with a wall thereof providing said blade support surface, a downward projecting portion protrudes from said blade within said channel and the walls thereof provide said first and second blade surfaces, said first wedge means is a plurality of members projecting within said channel and said second wedge means is a plurality of inclined planes projecting from said wedge bar against said members.

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2. An assembly in accordance with claim 1 in which a channel is formed in said blade support with a wall thereof providing said blade support surface, a downward projecting portion protrudes from said blade within said channel and the walls thereof provide said first and second blade surfaces, said first wedge means is a plurality of members projecting within said channel and said second wedge means is a plurality of inclined planes projecting from said wedge bar against said members. 